Type: Article
Publication Date: 2012-02-04
Citations: 131
DOI: https://doi.org/10.4171/jems/307
We strengthen the Carleson-Hunt theorem by proving L^p estimates for the r -variation of the partial sum operators for Fourier series and integrals, for r>\max\{p',2\} . Four appendices are concerned with transference, a variation norm Menshov-Paley-Zygmund theorem, and applications to nonlinear Fourier transforms and ergodic theory.